| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide technique capable of separately determining abnormality of a fuel property sensor and abnormality of a piping system.SOLUTION: An abnormality determination device 1 includes a fuel property sensor 3 capable of detecting properties of fuel delivered from a fuel tank 21 by a fuel pump 23 and flowing through piping, sensor abnormality determination means 31 for determining abnormality of the fuel property sensor 3, and piping system abnormality determination means 32 for determining abnormality of a piping system 4 including the fuel pump 23 and the piping. The fuel property sensor 3 includes a capacitance detection circuit 12 and a temperature detection circuit 13 for detecting a detection value related to the properties of the fuel, and a microcomputer 11 for outputting an output value obtained by processing the detection value input from the capacitance detection circuit 12 and the temperature detection circuit 13. The sensor abnormality determination means 31 determines abnormality of the fuel property sensor 3 based on the variation of the detection value or the output value obtained by processing the detection value. The piping system abnormality determination means 32 determines abnormality of the piping system based on the variation of the output value obtained by processing the detection value.</p> |
